PMID: 3752286Sep 1, 1986Paper

Metabolic sources of energy for hummingbird flight

The American Journal of Physiology
R K SuarezP W Hochachka

Abstract

It has been known for some two decades that hovering flight in hummingbirds is the most energetically expensive muscle work known among vertebrates, but the metabolic support for such work has never been clarified. Measurement of the maximum activities of key enzymes of carbohydrate, fat, and amino acid catabolism in flight muscle and heart of rufous hummingbirds (Selasphorus rufus) reveals that the high ATP requirements of short-term hovering flight can only be supported by the oxidation of carbohydrate. Fat oxidation can support a substantially lower maximum rate of ATP turnover, indicating that this process can power only the lower +.++energetic requirements of long-term forward or migratory flight. Mitochondria isolated from flight muscle oxidize pyruvate and palmitoyl-CoA equally well. The inhibition of pyruvate oxidation by palmitoyl-CoA oxidation provides a mechanism by which fat oxidation inhibits carbohydrate oxidation in the transition from short- to long-term flight.

Citations

May 13, 2005·Proceedings. Biological Sciences·François CriscuoloFrederic Bouillaud
Feb 16, 2005·Annual Review of Physiology·George N Somero, Raul K Suarez
Dec 15, 2010·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Edwin R PriceChristopher G Guglielmo
May 25, 2012·The Journal of Experimental Biology·Sarah KuzmiakWayne T Willis
Jul 21, 2009·The Journal of Experimental Biology·Isabel Walter, Frank Seebacher
Jul 27, 2010·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Kenneth C Welch

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